RUPPEL, Edward T. <br/><br/>
A pleistocene ice sheet in the northern boulder mountains Jefferson, powell, and lewis and Clark counties, Montana / 
by Edward T. Ruppel. 
 -- Washington :   United States Government Printing Office,   1962 
 - 22 p. + map. -- 
 (Geological Survey Bulletin  ;  1141-G).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Montana<br/>Pleistoceno
<br/><br/><label>Universal Decimal Class. No.: </label>551.791(786)